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O. F. MAYHBW.

-COAL STOVE."

Patented June 29, 1869-.

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17j/vena?? l witnesses:

N. PETERS, Plmmhognpbm. wnhingion. IJA C.

OSCAR E. MAYHEW, or INDIANAPOLIS, INDIANA.-

Letters Pate-nt No. 91,857, dated June 29, 1869; antezlated Tune 1.7, 1869.

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The Schedule referred to in these Letters Patent and making part of the same.

ner, and under conditions to effect a more thorough combination of' the air with the carbon and gases, and hence a more complete combustion than hereto- Figure 1 is a front .View of' a stove with my improvements arranged therein. '4 l Y lligure 2 is a verticai transverse sectionthereof..

`Figure '3 is a horizontal section. V

'Figure 4 is a horizontal section of a corrugated back, which may be used in place of the plain hack D, for the purpose hereinafter explained.

Figure 5 isa vertical section through' the centre, and p Figure 6 is a horizontal section, just below the pipe P, of a round base-burning stove, in which air is supplied, and cominingled and concentrated with the game," (carbon and gases,) in the same manner as in the square stove, fig. 1 4 Y l v Figures 7 and 8 represent a modification of essentially the same arrangement, Aapplied to boiler-furnaces. e

Other modifications of' construction, in which fresh air is commingled and concentrated with the flame, (carbon and gases) under the same conditions as herein set forth, may be applied to a great variety of' vheating and cooking-stoves and furnaces.

The arrangement ofthe several parts of a Vstove in .which the carbon and gases are all concentratednear the hotrcoals as they escape from thefuel to the combustion-chamber, and the manner of supplying fresh air so as to be commingled and concentrated with them just as they escapel from the fuel while in the condition of' hot tlame, in order to effect a more complete combination or combustion of the carbon and gases, will ,be readily understood from the drawings and the following description.

V A is the external case'of the stove.

, B, the grate or fire-pot. D, the back of the fuel-chamber or partition, separating the fuel from the combustion or ladiating-'chamber. lhis partition answers lto the upper part ofthe cylindrical fuel-chamber above kthe grate or fire-pot B in the round stove, figs. and 6.

d is the contracted opening or throat, through which Vall the carbon and gases eliminated from the burning fuel must 4pass into the combustion or radiating-chamber.

The throat (l is situated at the-bottom of the partition D, and' the rear-inclined portion of the fire-pot or grate B is arranged with reference to the partition D or back of the fuel-chamber, so as to hold the burning fuel close to the Vthroat d.

The carbon and gases are all drawn to, and concentrated at the throat d, and the inclined portion of the grate below and in front of the throat is made open, so as to admit fresh air to the flame (carbon and gases) just as it leaves the f'nel L, and before it passes through the throat d, as indicated by the arrows at this part ofthe grate.

The rear inclined portion of the fire-pot, instead of' being grate, may be a perforated plateA for the admission of' air to the flame, as above described; but I p r'ef'er the grate-,bars aslbeing more easily kept open,

and more' practicable forgeneraluse'.

Theflaring open grate or fire-pot of' the cylindrical stove, figs-5 and 6, is analogous to that ofthe rectangnlarstove, iig. 1, so far as supplying fresh air to the escaping carbon and gases is concerned.

H is a plate, which may' be a continuation of the fire-pot B to the back or' externed case of the stove, and forming part of the bottom of the combustionchamber:

In stoves where the volume of dame, after passing y the throat d, is large and hot, and especially when the deflecting-plate E is used, the plate H may be perforated to admit an additional supply of` air to the flame above the throat; but much air should not Abe admitted into the combustion-chamber above the throat, as, if the combustion-chamber is cooled by the admission of' air to it, ,the combustion of` the gases is less complete. i

E is a deiiecting-plate, placed above the throat el, provided with .an opening, g, for the passage of' the llame, and a slide or damper, F, to regulate the size of opening g.

This plate serves to prevent too rapid a dissipation or separation ofthe flame, and aids in the more com l 0 plete combustion of the gases by retaining them longer near the hot coals.

The damper F may also be used to regulate the draught ofthe stove. i

I is av swinging plate or damper, for shutting off or regulating the supply of air through the back part of the grate to the dame, and is chiefly used in starting up the fire by turning the draught through the fuel.

N are openings in the outer case A, t'or supplying air to the ilame through the rear of the grate, so that the proper combustion of the escaping gases may con- `tinue after active combustion ceases in the body of' the fuel-when the'air is shutoff from the front/and bottom of the grate. K

,These openings are provided with a shutter to regbe corrugated on the fuel-side, as shown in fig. 4,'

which will prevent the coals packing close against it, and allow the gases eliminated in the fuel above to be drawn back along the corrugations to the throat d, and will also allow air to pass downward along them, when admitted at the fuel-door or otherwise, above the fuel, which will be commingled and concentrated with theilaime and gases at the. throat d, in the same manner as the air admitted through the grate below, and in front of the throat.

` 1t will be seen that fresh ain-supplied in the manner herein described, is brought in -forcible contact with the 'flame and gases just as they leave the fuel, and issue through throat d, and acts upon them to excite a more thorough combustion as they pass away.

v supply ofair to the flame and gases between the fuel and throat d, substantially as and for the purpose set forth.

3. The deecting-plate E, with its opening g, either with or wit-hout the damper F, in combination with the throat d, ,substantiallyl as and for the purposes set oscAn RMAYHEW.

, forth.

Witnesses;

M. F. COLLIER, GEO. W. DUNN. 

